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United States Patent | 5,601,881 |
Grimm ,   et al. | February 11, 1997 |
The coating of bodies rotating about an axis with a reaction mixture forming a polyurethane can be improved by making use of a sheet die disposed parallel to the axis of rotation of the body at an angle .alpha., whereby the rate of reaction of the reaction mixture and the relative movement are synchronized with the circumferential speed of the rotating body in such a way that the successive convolutions overlap in the form of scales and connect together seamlessly.
Inventors: | Grimm; Wolfgang (Leverkusen, DE); Bruning; Dirk (Leverkusen, DE); Recker; Klaus (Koln, DE); Ruprecht; Hans-Dieter (Koln, DE); Muller; Heinz (Leverkusen, DE) |
Assignee: | Bayer Aktiengesellschaft (Leverkusen, DE) |
Appl. No.: | 436940 |
Filed: | May 8, 1995 |
Jul 30, 1993[DE] | 43 25 653.8 |
Current U.S. Class: | 427/425; 156/187; 156/195; 156/244.13; 264/209.2; 427/385.5; 427/388.1; 427/430.1 |
Intern'l Class: | B05D 005/00; B29C 053/62 |
Field of Search: | 427/385.5,388.1,425,430.1 156/187,195,244.13 264/209.2 188/DIG. 11,77 |
4259137 | Mar., 1981 | Kemmerling | 156/350. |
4366972 | Jan., 1983 | Franklin | 285/55. |
4459168 | Jul., 1984 | Anselm | 156/143. |
4466854 | Aug., 1984 | Hawerkamp | 156/429. |
5290632 | Mar., 1994 | Jadhav et al. | 428/423. |
Foreign Patent Documents | |||
945019 | Apr., 1971 | CA. | |
523509 | Jan., 1993 | EP. |
Modern Plastics International, vol. 23, No. 7, Jul. 1993, Lausanne Ch, pp. 20-22, Peter Mapelston, "Turnkey coating system covers pressure gas pipe". Patent Abstracts of Japan, vol. 12, No. 155 (C-494) May 12, 1988, & JP-A-62 266 175 (Konoshirouku Photo Ind.). Patent Abstracts of Japan, vol. 9, No. 323 (P-414) Dec. 18, 1985 & JP-A-60 150 053 (Konishiroku) Aug. 7, 1985. |
______________________________________ Hardness (Shore A) 90 Tensile strength (MPa) 20 Elongation at tear 450 ______________________________________